Number 20 of the Itemized Listing does include documentation of all requested accommodations and their resolution. That would include any accommodations requested by applicants. Here is a link to the itemized listing: https://www.dol.gov/ofccp/regs/compliance/faqs/SchedulingLetter_ItemizedListing_508c.pdf. With regard to the best way to track and document the information, that is really dependent upon your recruiting process. In general I would suggest identifying who is responsible for taking the requests at each stage of the recruiting/hiring process and create a template/form for them to complete. Identify a centralized depository and review the documentation on a regular basis.
You can use this OFCCP audit checklist to ensure you're doing what is required to maintain OFCCP's regulations including VEVRAA, Section 503, and EO 11246. Or request a demo to streamline your compliance and recruiting efforts.